ORDER
Wе must decide whether any of the claims in this petition for leave to file a second and successive habeas petition made by a petitioner under sentence of death are cognizable at this stage.
I
Petitioner Donald Edward Beaty, who was convicted of murder in Arizona state court in 1985, filed a habeas petition with the United States District Cоurt for the District of Arizona in 1992, which it denied in 1999. Beaty then appealed to this court. On August 27, 2002, we denied a certificate of appealability on all claims except as tо the voluntariness of Beaty’s confession. We “remand[ed] to the district court for an evidentiary hearing limited to” consideration of the voluntariness claim.
Beaty v. Stewart (“Beaty I”),
While Beaty II was pending bеfore this court, Beaty (who was represented by counsel) made several pro se submissions, including an “Application for Certificate of Appealability to Expand the Record and/or Application to File Second and Successive 2254 Petition for Writ of Habeas Corpus (28 U.S.C. 2244(b)) and Appointment of Counsel.” On March 25, 2008, we construed this filing as an aрplication for a second or successive habeas petition and ordered it filed under this new docket. We directed Beaty’s counsel to address the issues raised in that application, which we now consider in turn.
II
A
Beaty argues that we should have considered his claims raised in his 2008 pro se filing as part of his original habeas petition. He also argues that the district court should have allowed him to amend his habeas petition in 2005.
B
To support his claims, Beaty cites
Woods v. Carey,
C
Beaty also cites the reasoning of
Ching v. United States,
Ching is of little relevance. Beaty has already had an opportunity to have all his claims decided upon — by the district court in 1999, by this court in 2002, and by the Supreme Court in 2003. We dеnied all of Beaty’s claims except for the voluntariness claim, which we remanded. Not only had we ruled in Beaty’s case, but that ruling — that Beaty’s petition was denied as to all grounds but voluntariness — had become final two years before Beaty petitioned for an amendment in the district court. The district court did not err by denying Beaty leave to amend.
D
Accordingly, Beaty must meet the standard required of him by 28 U.S.C. § 2244(b). He must either show “that the claim relies on a new rule of constitutional law, made retroactive to cases on collatеral review by the Supreme Court, that was previously unavailable” or that both “the factual predicate for the claim could not have been discovered previously through the exercise of due diligence [and] the facts underlying the claim, if proven and viewed in light of the evidence as a whole, would be sufficient to establish by clear and сonvincing evidence that, but for constitutional error, no reasonable factfinder would have found the applicant guilty of the underlying offense.” 28 U.S.C. § 2244(b)(2). He has failed to make a showing of either.
Ill
A
Beaty argues that we should have considered his pro se filings, as they “would have informed the Court’s decision on the voluntariness issue.” The only potentially significant fact counsel points to is that “Dr. Overbeck testified how the group attack on Beaty would have compelled him to seek comfort from the group therapist to reaffirm his human worth, and to seek assurances, endorsement, and safety.” *784 Dr. Overbeck’s testimony was before us in the earlier case, as was the entire district court record. Beaty’s argument is without merit.
B
Beaty’s claim that a judge imposed the death sentence in violation of this court’s decision in
Adamson v. Ricketts,
C
Beaty’s claim that he is “innocent of the death penalty” is unconvincing. In his brief, Beaty points to alleged organic brain damage and his rearing in a “profoundly abusive and dysfunctional family.” At most, however, these would constitute factors in mitigation. A claim of actual innocence of the death penalty would require a showing that one of the statutory aggravators or other requirements for the imposition of the death penalty had not been met.
Sawyer v. Whitley,
D
Beaty claims that he is actually innocent of the murder of Christy Ann Fornoff. He asserts that the prosecution’s lead witness at the trial, Angel Bello, killed a fourteen-year-old “girl named Tina Reed in exactly the same manner in which Christy Fornoff was killed.” Assuming, without deciding, that Bello did in fact murder Tina Reed, mere speculation about a possible suspect is not еnough to meet the standard required by § 2244(b). Furthermore, any such suspicion is severely undercut by the physical evidence. At trial, an investigator testified that the semen stains could be identified as coming from a type B secretor with a PGM type of 1 and a PGM subtype of 1 + 1-. In contrast, Bello is a type A secretor. Thus, Beaty cannot demonstrate that “facts underlying the сlaim, if proven and viewed in light of the evidence as a whole, would be sufficient to establish by clear and convincing evidence that ... no reasonable fact-finder would have found the applicant guilty оf the underlying offense.” 28 U.S.C. § 2244(b)(2).
E
Beaty also raises a claim that he may not be executed under
Atkins v. Virginia,
IV
Finally, Beaty asks us to declare section 2244 unconstitutional. This question is firmly settled by Ninth Circuit case law against Beaty’s position.
See Crater v. Galaza,
V
Finding no merit in any of the claims newly raised by Beaty, the application to file a second or successive writ of habeas corpus is DENIED. No рetition for rehearing or motion for reconsideration shall be filed or entertained in this case. See 28 U.S.C. § 2244(b)(3)(E).
Notes
. Although this court in Woods quoted extensively from Ching, we did not address whether its holding would apply to a petition on apрeal after having been denied in the first instance by the district court. Today, we decide that Beaty cannot use Woods to amend his petition after the district court has ruled and proceedings have begun in this court (much less after the Supreme Court denied certiorari on the claims on which we had already ruled).
. Walton
itself was overruled in
Ring v. Arizona,
. Beaty has had many opportunities to exhaust his
Atkins
claim in state court. The state trial cоurt allowed for psychological testing of Beaty to determine if he is mentally retarded prior to the filing of his fifth amended complaint. Beaty filed his fifth petition for post-conviction relief on October 29, 2003, and amended it on April 21, 2004. He filed a sixth petition on October 17, 2005. In neither of these petitions did Beaty raise an
Atkins
issue. Against this background, it appears that Beaty is engaging in “needless piecemeal litigation[, or] ... collateral proceedings whose only purpose is to vex, harass, or delay.”
Sanders v. United States,
